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Diogo Ivo says ==================== Enable PTP timestamping/PPS for AM65x SR1.0 devices This patch series enables support for PTP in AM65x SR1.0 devices. This feature relies heavily on the Industrial Ethernet Peripheral (IEP) hardware module, which implements a hardware counter through which time is kept. This hardware block is the basis for exposing a PTP hardware clock to userspace and for issuing timestamps for incoming/outgoing packets, allowing for time synchronization. The IEP also has compare registers that fire an interrupt when the counter reaches the value stored in a compare register. This feature allows us to support PPS events in the kernel. The changes are separated into five patches: - PATCH 01/05: Register SR1.0 devices with the IEP infrastructure to expose a PHC clock to userspace, allowing time to be adjusted using standard PTP tools. The code for issuing/ collecting packet timestamps is already present in the current state of the driver, so only this needs to be done. - PATCH 02/05: Remove unnecessary spinlock synchronization. - PATCH 03/05: Document IEP interrupt in DT binding. - PATCH 04/05: Add support for IEP compare event/interrupt handling to enable PPS events. - PATCH 05/05: Add the interrupts to the IOT2050 device tree. Currently every compare event generates two interrupts, the first corresponding to the actual event and the second being a spurious but otherwise harmless interrupt. The root cause of this has been identified and has been solved in the platform's SDK. A forward port of the SDK's patches also fixes the problem in upstream but is not included here since it's upstreaming is out of the scope of this series. If someone from TI would be willing to chime in and help get the interrupt changes upstream that would be great! Signed-off-by: Diogo Ivo <diogo.ivo@siemens.com> --- Changes in v4: - Remove unused 'flags' variables in patch 02/05 - Add patch 03/05 describing IEP interrupt in DT binding - Link to v3: https://lore.kernel.org/r/20240607-iep-v3-0-4824224105bc@siemens.com Changes in v3: - Collect Reviewed-by tags - Add patch 02/04 removing spinlocks from IEP driver - Use mutex-based synchronization when accessing HW registers - Link to v2: https://lore.kernel.org/r/20240604-iep-v2-0-ea8e1c0a5686@siemens.com Changes in v2: - Collect Reviewed-by tags - PATCH 01/03: Limit line length to 80 characters - PATCH 02/03: Proceed with limited functionality if getting IRQ fails, limit line length to 80 characters - Link to v1: https://lore.kernel.org/r/20240529-iep-v1-0-7273c07592d3@siemens.com ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.